Automatic installation of my app APK on user's device
I have an APK of my first app (i'm a student, it's our study project). I need to show it on some event and i don't want to put it on google store yet or at all. I need to provide a QR code to installation. I can store the APK on my server and provide a QR for link to download the APK, but it just downloads it and don't start the installation. How can i make the installation start automatically?
PS. I need the apk file be autorunnable. For example, if I send it by whatsapp, clicking on the file will download it and start the installation. Whatsapp does 2 things - downloads it and opens the downloaded. How can i do it with something, that i can provide to users as a regular link?